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TI汽车安全系统解决方案


Solutions for Advanced Automotive Safety Systems
Justin Hua Applications Engineer Texas Instruments

What is Functional Safety?
? IEC 61508 Definition: Safety is the freedom from unacceptable risk of physical injury or of damage to the health of people, either directly, or indirectly as a result of damage to property or to the environment. Functional Safety is part of the overall safety that depends on a system or equipment operating correctly in response to its inputs. For example, an overtemperature protection device which de-energizes a motor before it can overheat is an example of functional safety. A specialized motor which can withstand high temp without failure IS NOT functional safety. ISO 26262 Definition: Absence of unacceptable risk due to hazards caused by mal-functional behavior of electrical and/or electronic systems

?

2010-12-23

Texas Instruments NDA Restrictions

Functional Safety vs. Quality/Reliability
? High quality and reliability does not guarantee safety. Current Toyota unintended acceleration cases are good example. ? Methods to ensure quality and reliability have high overlap to methods used to manage systematic safety failures. Zero DPPM efforts Safe Launch programs ? Requirements to manage safety of random hardware failures in application typically do not overlap quality and reliability requirements.

2010-12-23

Texas Instruments NDA Restrictions

TI Automotive Safety Experience MSA Braking Experience
? ? ? Braking and Airbag Systems are the primary active and passive safety systems in automotive today TI has more than 15 years of experience in Mixed Signal and Micro-controller silicon development for safety critical applications Braking Mixed Signal Controller, Sensor Interface, Micro-controller Anti-lock Brake Systems (ABS) Traction Control Systems (TCS) Electronic Stability Control (ESC) Electronic Park Brake (EPB) ESC Sensor Cluster Airbag Airbag Controller (Power management, Squib drive, Micro-controller) Peripheral Systems (Occupant Weight Sensing, High G Accelerometer, Seat belt Pretensioning, etc.) Steering Electronic Power Steering (Power management, Sensor interface, Motor Control, Microcontroller)

?

?

Mixed Signal Safety
Focus
Braking
ABS Analog Support Chip ESC Analog Support Chip Other Chassis EPB Analog Controller Sensor Cluster

Key Products
ASSP Products in Development Future ASSP Products

TPIC7218 8 channel Integrated Valve Driver TPIC7602 4 channel ABS IC for 2 wheeler TPIC72212 12 channel Integrated Valve Driver TPIC7238 12 channel Pre-FET driver TPIC7710 Electric Park Brake TPIC7601 Sensor Fusion SoC

Airbag
Squib Drivers Power Management

TPIC71801/TPIC71883/TPIC71822 4/8/2 channel squib TPIC7112 Integrated Power Management includes PSI5 interface, buckle switch, K-line

EPS
Bridge Driver EPS Analog Support Chip

TPIC7312 3-phase Motor Bridge Driver TPIC7301 Integrated Power and Sensor Interface

Safety Market Trends
Braking
? ? ? ? ? ? ? ? ? ? ? Continued semiconductor up-integration to reduce module footprint, weight and cost ESC legislation has gained wolrdwide momentum EMB (ElectroMechanical Brakes)/EHB (ElectroHydraulic Brakes) Increased momentum for FlexRay support Commodity market Proliferation of satellite sensors and actuators (32 high end) Black box and pre-safe seat belt tensioners Pedestrian Protection Child seat detection Autosar Potential integration of Safety Systems for cost and performance

Airbag

Domain Controllers

Airbag Systems

Airbag System Diagram
Battery Power Management Module (TPIC7112 or Discrete) Warning Warning Lamp Driver Lamp Driver Warning Lamp Satellite Satellite Interface Interface Fail Safe Fail Safe Module Module Boost Boost Squib Driver IC Buck/LDO Buck/LDO Channel 1 Airbag Squib 1 SPI Channel x2 TPIC71822

K-Line K-Line

Supervisor Supervisor

Diagnostic Systems ISO K-Line

Buckle Switches CAN Bus CAN CAN Transceiver Transceiver

Airbag MCU TMS470

Digital Digital Core, Core, Diagnosis Diagnosis & & Control Control

Channel X4 TPIC71801 Airbag Squib n Channel X8 TPIC71883

Satellite Satellite Interface Interface Crash Sensors

Low-end to Mainstream Airbag – “Scalability Options”
512k 384k 256k 192k 12k RAM 16k RAM 24k RAM 32k RAM

TMS470PF541 Airbag ECU
CAN

TMS470PSC34x
CAN CAN CAN

TMS470PSC244

High-end TMS570 available
CAN SN65HVD1040

TMS470PSC241

Fail Safe Module

MibSPI MibSPI

ISO K-Line Interface Driver

SCI

MibSPI

Supervisor uC

EEPROM EEPROM x, y gSensors x, y gSensors

Sensor I/F IC

Warning Lamp Driver

SPI Interface Configuration / Status Registers

TPIC71801 4x Squib TPIC71801 4x Squib

TPIC7xxxx 4x Squib TPIC7xxxx 8x Squib

Power Supply Module

PSI5

Airbag Power Management ASSP

ABS Fundamentals

ABS System Diagram
Power Management Module Battery Supervisor Supervisor Wake up Buck/LDO Buck/LDO Charge Pump Charge Pump Main Relay Driver Solenoid LS Switch Driver Watchdog Watchdog Monitor Monitor LS Switch Driver x4 Solenoid LS Switch Driver PWM LS Switch Driver PWM x4 ABS IC TPIC7218 Pump Motor Driver

M

Chassis CAN Bus

CAN CAN Transceiver Transceiver

ABS ABS MCU MCU TMS470/570 TMS470/570

SPI SPI

Wheel Speed Sensor x4

Wheel Speed Wheel Speed Sensor Sensor Interface Interface

Lamp Driver K-Line K-Line Lamp Driver x2

Diagnostic Systems ISO K-Line

Warning Lamp

TPIC7218EVM and functional emulation WSSOUT with LEDs digital
Wheel speed sensors outputs

Low voltage power supplies

Low-Side drivers

TIger board

Warning lamps

Relays

ESC System Diagram
ESC Sensor Cluster Module Battery Gyro Gyro ABS IC TPIC7218 Power Management Module Supervisor Supervisor Wake up Buck/LDO Buck/LDO Power Power Management Management MCU MCU CAN CAN Transceiver Transceiver Center of Car Chassis CAN Bus Watchdog Watchdog Monitor Monitor Charge Pump Charge Pump Pump Motor Driver

M

Low G Accelerator Low G Accelerator

Main Relay Driver Solenoid LS Switch Driver LS Switch Driver x4 Solenoid

Sensor Cluster Interface SOC TPIC7601

CAN CAN Transceiver Transceiver CAN CAN Transceiver Transceiver

ABS ABS MCU MCU TMS470/570 TMS470/570

LS Switch Driver PWM SPI SPI Wheel Speed Wheel Speed Sensor Sensor Interface Interface K-Line K-Line LS Switch Driver PWM x4

Wheel Speed Sensor x4

Lamp Driver Lamp Driver x2

Diagnostic Systems ISO K-Line Under the hood

Warning Lamp Solenoid

Additional IC Additional IC LS Switch Driver PWM x4 LS Switch Driver PWM x4

Other Braking System ICs
Today’s systems
Sensor Cluster Sensor Cluster
g g CAN y y

TI’s Solution

Sensor Cluster SOC

Park Brake Airbag ECU Airbag ECU
g Chassis CAN g

ESC ESC

Park Park Brake Brake

Analog

uC

g g y y g g

low-g acceleration sensor (longitudinal and lateral) yaw rate sensor (vertical and longitudinal) high-g acceleration sensor (longitudinal and lateral)

Park Brake Electric Park Brake

April 2009

TI Proprietary Information - Strictly Private

14

Electric Power Steering
EPS replaces the pump, proportional valve, hydraulic cylinder and associated plumbing with an electromechanical servo.

Conventional Hydraulic vs. Rack EPS

Power Steering System Diagram
System ASIC Power Power Supplies Supplies UART UART Safety Safety Watchdog Watchdog Sensor Sensor Interface Interface SPI SPI MOSFETs Battery 7.9V 5V 3.3V 1.5V EPS Bridge Driver TPIC7312 SPI SPI Current Current Sensing Sensing Diagnosis Diagnosis Drivers Drivers

CAN Bus FlexRay Bus

CAN CAN Transceiver Transceiver FlexRay FlexRay Transceiver Transceiver

CAN CAN

SCI SCI

SPI SPI

FlexRay FlexRay EPS MCU TMS570 C2000

HET(PWM) HET(PWM) Steering Torque, Steering Torque, Steering Angle, Steering Angle, Rotation Sensors Rotation Sensors

ADC ADC

TPIC7312
EPS Bridge Driver
? Features ? 3 Phase Brushless DC Motor Bridge Driver ? Drives 6 separate N-Channel MOSFETup to 250nC gate charge ? Operating Voltage: 4.75 to 35 Volt ? Standoff voltage: 45V ? Reverse Battery Protection for Driver IC ? Logic functional down to 3 Volt ? Separate input for each MOSFET ? Boost Regulator to provide gate voltage, enable 100% duty cycle, and low voltage operation ? PWM frequency up to 30 kHz ? Sleep mode, reset, and enable functions ? Configurable through SPI / Data Latch ? Short circuit protection with adjustable detection level ? Two programmable current sense amplifiers ? Three Phase Comparators ? Over- and Undervoltage Shutdown ? Programmable Shoot Through Protection ? Over temperature warning and shut down ? 2 Safety related modes (SRM), with or without Bridge Driver pro active control ? Fault produces uC interrupt with details available through SPI.
VCC Check Boost Converter

Samples 3Q10

VDS Control and Diagnosis Logic Monitoring

Status ? Overtemp ? Over Voltage ? Under Voltage Level Shifting ? Short Circuit

Phase Comparator

High Side Driver 1..3

Configuration SPI ? VDS Threshold ? Dead Time ? Max Gate Current ? variable Gain Current Sense Digital Interface Status Register

Low Side Driver 1..3

Bias Reference

+ -

Shoot Through Prot. Prog. Gain Ampl.

+ -

ADAS Solutions to Enable Innovation and Fast Time to Market
Processors
TMS320DM642A TMS320DM643x TMS320DM648Auto TMS320C6747 Vision Low 1/1+ Vision Mid Roadmap Devices: Vision Low 2 Vision Mid 2 Vision High

Software for Development Support
DSP, Image & Vision Libraries with Simulink blocks and PC equivalent VICP (Video/Imaging CoProcessor) Library TI Demo Algorithms; TSR, RVM, BOP, Stereo 3rd Party Production Algorithms

Hardware Tools for Development Support
! oon S

Vision Mid EVM

ing om C

Vision Mid Vision Application Board

Thank you!


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